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Acta Cryst. (2005). E61, m1628-m1632  [ doi:10.1107/S1600536805023263 ]

[Co(H2O)6]{[Co(C4H4N2)(H2O)2][V2O2(pmida)2]}·2H2O [H4pmida is N-(phosphonomethyl)iminodiacetic acid]: the first two-dimensional hybrid framework containing [V2O2(pmida)2]4- building blocks

F. A. Almeida Paz, F.-N. Shi, L. Mafra, A. Makal, K. Wozniak, T. Trindade, J. Klinowski and J. Rocha

Abstract: The crystal structure of the title compound, polymeric hexaaquacobalt(II) diaquadioxodi-[mu]2-pyrazine-bis[[mu]3-N-(phosphonomethyl)iminodiacetato]cobalt(II)divanadate(IV) dihydrate, {[Co(H2O)6][CoV2(C3H4O8P)2(C4H4N2)2(H2O)2]·2H2O}n, is the first example of a two-dimensional hybrid framework containing centrosymmetric dimeric [V2O2(pmida)2]4- anionic units [H4pmida is N-(phosphonomethyl)iminodiacetic acid]. The structure contains two crystallographically unique cobalt(II) centres, both located at inversion centres and exhibiting Jahn-Teller-distorted octahedral coordination geometries. One Co2+ cation establishes physical links between adjacent [V2O2(pmida)2]4- anionic units, forming one-dimensional anionic ribbons which run along the [010] direction, {[Co(H2O)2][V2O2(pmida)2]}n2n-. Pyrazine ligands, with their centroids located at inversion centres, bridge the above-mentioned Co2+ centres, forming {[Co(H2O)2][V2O2(pmida)2]}n2n- anionic layers which alternate along the [001] direction with [Co(H2O)6]2+ cations and the water molecules of crystallization. An extensive and highly directional hydrogen-bonded network interconnects the structural components.

Online 27 July 2005


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